While the following clients will not integrate directly with Team Foundation Server 2012, you can use Team Explorer for Visual Studio 2012 to connect to your server to perform some operations such as checking files out for editing or checking in changes:

Visual Web Developer 2005

Visual Studio 2005

Visual Web Developer 2008

Visual Studio 2010 Express

To connect to Team Foundation Server 2012 using Team Explorer for Visual Studio 2012, the following steps should be taken: